First question is how old is it? Could have had issues and Wifi killed due to hardware or the antennas even, or it could maybe just be a setting. Have you done a backup of the configuration before? Maybe try a factory reset and attempt to set it up again. WIfi analyzer to see if you have other signals stepping all over your Wifi could be a problem also- especially the 2.4 Ghz which only has 11 channels and 3 are unique and not overlapping.
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